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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
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Coal
ultimate analysis
Mining; Coal
The exact analysis or test by which the determination of the elements and characteristics are found.
underground mine
Mining; Coal
An mine where coal or ore is extracted from below the earths surface through the use of tunneling and cutting machines.
underground station
Mining; Coal
A location in a mine where personnel and material are often transferred or discharged.
unit train
Mining; Coal
Many cars in one train going to the same destination and usually carrying the same load to make the trip more convenient.
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